Table 2.

Developmental Measures for Participants Completing the Bone Density Study

Variable Prepod Group (n = 10)a Control Group (n = 11)b 
M Range M Range 
Age     
 Birth age 29 wk, 6 days 28 wk, 4 days–31 wk, 4 days 29 wk, 6 days 28 wk, 2 days–31 wk, 4 days 
 Initial UTS age 32 wk, 2 days 30 wk, 5 days–32 wk, 5 days 32 wk, 3 days 31 wk, 2 days–32 wk, 5 days 
 Exit UTS age 36 wk, 1 day 34 wk, 4 days–37 wk, 1 day 36 wk, 2 days 35 wk, 2 days–36 wk, 5 days 
SOS, m/s     
 Initial SOS 2,911 2,705–3,032 2,918 2,756–3,045 
 Exit SOS 2,848 2,755–2,934 2,803 2,653–2,973 
 SD 95.48  79.99  
 t −3.5   
df 10   
 p .27   
Weight gain, g     
 Birth weight 1,426 1,145–1,825 1,472 1,080–1,975 
 Discharge weight 2,556 2,085–3,255 2,811 2,481–3,295 
 Gain (range) 1,132 (567–1,770)  1,339 (826–1,780)  
 Daily growth 26.28  25.26  
SD 372  273  
 t −1.40   
 df 10   
 p .09   
Head circumference, cm     
 At birth 27.9 24.5–31.8 28.9 25.0–31.5 
 At discharge 32.2 30.5–35.5 33.4 31.5–35.5 
 Growth per day (range) 0.10 (0.20–6.50)  0.10 (2.00–8.80)  
SD 2.03  2.02  
t −1.43   
df 10   
p .09   
Variable Prepod Group (n = 10)a Control Group (n = 11)b 
M Range M Range 
Age     
 Birth age 29 wk, 6 days 28 wk, 4 days–31 wk, 4 days 29 wk, 6 days 28 wk, 2 days–31 wk, 4 days 
 Initial UTS age 32 wk, 2 days 30 wk, 5 days–32 wk, 5 days 32 wk, 3 days 31 wk, 2 days–32 wk, 5 days 
 Exit UTS age 36 wk, 1 day 34 wk, 4 days–37 wk, 1 day 36 wk, 2 days 35 wk, 2 days–36 wk, 5 days 
SOS, m/s     
 Initial SOS 2,911 2,705–3,032 2,918 2,756–3,045 
 Exit SOS 2,848 2,755–2,934 2,803 2,653–2,973 
 SD 95.48  79.99  
 t −3.5   
df 10   
 p .27   
Weight gain, g     
 Birth weight 1,426 1,145–1,825 1,472 1,080–1,975 
 Discharge weight 2,556 2,085–3,255 2,811 2,481–3,295 
 Gain (range) 1,132 (567–1,770)  1,339 (826–1,780)  
 Daily growth 26.28  25.26  
SD 372  273  
 t −1.40   
 df 10   
 p .09   
Head circumference, cm     
 At birth 27.9 24.5–31.8 28.9 25.0–31.5 
 At discharge 32.2 30.5–35.5 33.4 31.5–35.5 
 Growth per day (range) 0.10 (0.20–6.50)  0.10 (2.00–8.80)  
SD 2.03  2.02  
t −1.43   
df 10   
p .09   

Note. SOS = speed of sound; UTS = ultrasound.

a

The prepod group was composed of 5 male infants and 5 female infants.

b

The control group was composed of 7 male infants and 4 female infants.

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